These batteries are prone to a process known as thermal runaway; when energetic positive feedback causes the temperature to rise and causes a “violent reaction” (or explosion).

“Ambient temperatures exceeding 60 degrees C, repeated overcharging, or unauthorized modifications to the case have all also been reported as the source of battery fires,” read an article by Gizmodo.

And the risks aren’t just limited to smartphones.

In 2009, an overheated laptop computer left on a couch caused a fire that killed a 55-year-old Vancouver man. The laptop contained a lithium-ion battery, according to the Coroners Service of British Columbia.

Even aircraft manufacturer Boeing was forced to ground its entire fleet of next-generation planes after lithium-ion batteries caught fire on two aircrafts.

Over-charging, over-use and knock-off chargers may increase fire risk

Though Casserly maintains that the phone was not plugged into its wall charger when its battery exploded, over-charging is said to be one of the leading causes of battery explosions.

While some smartphones protect their batteries from over charging, experts recommend that users remove their device from the wall charger as soon as it has a full charge.

If you ever have to replace your smartphone’s battery, make sure it’s authorized by the device manufacturer. Some low-cost alternatives may be cheaply made.

Authorities said they believed a $4.95 USB-style charger that was connected to the cellphone she was using is to blame for shocking her with a “high-voltage electrical pulse,” according to the Sydney Morning Herald.